|If you want to know what "x" is worth, and its an object that was mass-produced, and legal to sell, then looking at closed auctions on eBay is your best bet. "Used" sales on Amazon are another good bet. |
As it happens, a model 0001A without keyboard, mouse or power cord just sold for $41 on ebay, and there's one that sounds similar to yours but without software, bidding still open, for $79.99. What ever that one closes for, yours, with software, is presumably worth more.
Search "Macintosh Plus", then select Advanced and re-search with "completed auctions" checked. Prices in red didn't sell. Prices in green are end-of-auction. Note shipping charges.
There are two complete-looking buy-it-now systems over $200, so at a guess, your system is worth something in that neighborhood. They don't have Imagewriters- you might get $300 for the whole kit and kabootle.
I remember paying $2500 retail for my first Mac Plus + printer...
In contrast, one like my G3 Tower just sold for $45, and $42 shipping, which is a whole lot closer to worthless!